Airplane



FIG. 1 is an elevated side view, both sides being identical, of an airplane showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is an elevated front view thereof;

FIG. 5 is an elevated rear view thereof; and,

FIG. 6 is an elevated perspective view thereof. 

The ornamental design for an airplane, as shown and described. 